drivers/extcon/extcon-max77843.c

   1 /*
   2  * extcon-max77843.c - Maxim MAX77843 extcon driver to support
   3  *                      MUIC(Micro USB Interface Controller)
   4  *
   5  * Copyright (C) 2015 Samsung Electronics
   6  * Author: Jaewon Kim <jaewon02.kim@samsung.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/extcon.h>
  15 #include <linux/i2c.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mfd/max77843-private.h>
  19 #include <linux/module.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/workqueue.h>
  22
  23 #define DELAY_MS_DEFAULT                15000   /* unit: millisecond */
  24
  25 enum max77843_muic_status {
  26         MAX77843_MUIC_STATUS1 = 0,
  27         MAX77843_MUIC_STATUS2,
  28         MAX77843_MUIC_STATUS3,
  29
  30         MAX77843_MUIC_STATUS_NUM,
  31 };
  32
  33 struct max77843_muic_info {
  34         struct device *dev;
  35         struct max77843 *max77843;
  36         struct extcon_dev *edev;
  37
  38         struct mutex mutex;
  39         struct work_struct irq_work;
  40         struct delayed_work wq_detcable;
  41
  42         u8 status[MAX77843_MUIC_STATUS_NUM];
  43         int prev_cable_type;
  44         int prev_chg_type;
  45         int prev_gnd_type;
  46
  47         bool irq_adc;
  48         bool irq_chg;
  49 };
  50
  51 enum max77843_muic_cable_group {
  52         MAX77843_CABLE_GROUP_ADC = 0,
  53         MAX77843_CABLE_GROUP_ADC_GND,
  54         MAX77843_CABLE_GROUP_CHG,
  55 };
  56
  57 enum max77843_muic_adc_debounce_time {
  58         MAX77843_DEBOUNCE_TIME_5MS = 0,
  59         MAX77843_DEBOUNCE_TIME_10MS,
  60         MAX77843_DEBOUNCE_TIME_25MS,
  61         MAX77843_DEBOUNCE_TIME_38_62MS,
  62 };
  63
  64 /* Define accessory cable type */
  65 enum max77843_muic_accessory_type {
  66         MAX77843_MUIC_ADC_GROUND = 0,
  67         MAX77843_MUIC_ADC_SEND_END_BUTTON,
  68         MAX77843_MUIC_ADC_REMOTE_S1_BUTTON,
  69         MAX77843_MUIC_ADC_REMOTE_S2_BUTTON,
  70         MAX77843_MUIC_ADC_REMOTE_S3_BUTTON,
  71         MAX77843_MUIC_ADC_REMOTE_S4_BUTTON,
  72         MAX77843_MUIC_ADC_REMOTE_S5_BUTTON,
  73         MAX77843_MUIC_ADC_REMOTE_S6_BUTTON,
  74         MAX77843_MUIC_ADC_REMOTE_S7_BUTTON,
  75         MAX77843_MUIC_ADC_REMOTE_S8_BUTTON,
  76         MAX77843_MUIC_ADC_REMOTE_S9_BUTTON,
  77         MAX77843_MUIC_ADC_REMOTE_S10_BUTTON,
  78         MAX77843_MUIC_ADC_REMOTE_S11_BUTTON,
  79         MAX77843_MUIC_ADC_REMOTE_S12_BUTTON,
  80         MAX77843_MUIC_ADC_RESERVED_ACC_1,
  81         MAX77843_MUIC_ADC_RESERVED_ACC_2,
  82         MAX77843_MUIC_ADC_RESERVED_ACC_3,
  83         MAX77843_MUIC_ADC_RESERVED_ACC_4,
  84         MAX77843_MUIC_ADC_RESERVED_ACC_5,
  85         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2,
  86         MAX77843_MUIC_ADC_PHONE_POWERED_DEV,
  87         MAX77843_MUIC_ADC_TTY_CONVERTER,
  88         MAX77843_MUIC_ADC_UART_CABLE,
  89         MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG,
  90         MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF,
  91         MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON,
  92         MAX77843_MUIC_ADC_AV_CABLE_NOLOAD,
  93         MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG,
  94         MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF,
  95         MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON,
  96         MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1,
  97         MAX77843_MUIC_ADC_OPEN,
  98
  99         /* The blow accessories should check
 100            not only ADC value but also ADC1K and VBVolt value. */
 101                                                 /* Offset|ADC1K|VBVolt| */
 102         MAX77843_MUIC_GND_USB_HOST = 0x100,     /*    0x1|    0|     0| */
 103         MAX77843_MUIC_GND_USB_HOST_VB = 0x101,  /*    0x1|    0|     1| */
 104         MAX77843_MUIC_GND_MHL = 0x102,          /*    0x1|    1|     0| */
 105         MAX77843_MUIC_GND_MHL_VB = 0x103,       /*    0x1|    1|     1| */
 106 };
 107
 108 /* Define charger cable type */
 109 enum max77843_muic_charger_type {
 110         MAX77843_MUIC_CHG_NONE = 0,
 111         MAX77843_MUIC_CHG_USB,
 112         MAX77843_MUIC_CHG_DOWNSTREAM,
 113         MAX77843_MUIC_CHG_DEDICATED,
 114         MAX77843_MUIC_CHG_SPECIAL_500MA,
 115         MAX77843_MUIC_CHG_SPECIAL_1A,
 116         MAX77843_MUIC_CHG_SPECIAL_BIAS,
 117         MAX77843_MUIC_CHG_RESERVED,
 118         MAX77843_MUIC_CHG_GND,
 119 };
 120
 121 enum {
 122         MAX77843_CABLE_USB = 0,
 123         MAX77843_CABLE_USB_HOST,
 124         MAX77843_CABLE_TA,
 125         MAX77843_CABLE_CHARGE_DOWNSTREAM,
 126         MAX77843_CABLE_FAST_CHARGER,
 127         MAX77843_CABLE_SLOW_CHARGER,
 128         MAX77843_CABLE_MHL,
 129         MAX77843_CABLE_JIG,
 130
 131         MAX77843_CABLE_NUM,
 132 };
 133
 134 static const char *max77843_extcon_cable[] = {
 135         [MAX77843_CABLE_USB]                    = "USB",
 136         [MAX77843_CABLE_USB_HOST]               = "USB-HOST",
 137         [MAX77843_CABLE_TA]                     = "TA",
 138         [MAX77843_CABLE_CHARGE_DOWNSTREAM]      = "CHARGER-DOWNSTREAM",
 139         [MAX77843_CABLE_FAST_CHARGER]           = "FAST-CHARGER",
 140         [MAX77843_CABLE_SLOW_CHARGER]           = "SLOW-CHARGER",
 141         [MAX77843_CABLE_MHL]                    = "MHL",
 142         [MAX77843_CABLE_JIG]                    = "JIG",
 143 };
 144
 145 struct max77843_muic_irq {
 146         unsigned int irq;
 147         const char *name;
 148         unsigned int virq;
 149 };
 150
 151 static struct max77843_muic_irq max77843_muic_irqs[] = {
 152         { MAX77843_MUIC_IRQ_INT1_ADC,           "MUIC-ADC" },
 153         { MAX77843_MUIC_IRQ_INT1_ADCERROR,      "MUIC-ADC_ERROR" },
 154         { MAX77843_MUIC_IRQ_INT1_ADC1K,         "MUIC-ADC1K" },
 155         { MAX77843_MUIC_IRQ_INT2_CHGTYP,        "MUIC-CHGTYP" },
 156         { MAX77843_MUIC_IRQ_INT2_CHGDETRUN,     "MUIC-CHGDETRUN" },
 157         { MAX77843_MUIC_IRQ_INT2_DCDTMR,        "MUIC-DCDTMR" },
 158         { MAX77843_MUIC_IRQ_INT2_DXOVP,         "MUIC-DXOVP" },
 159         { MAX77843_MUIC_IRQ_INT2_VBVOLT,        "MUIC-VBVOLT" },
 160         { MAX77843_MUIC_IRQ_INT3_VBADC,         "MUIC-VBADC" },
 161         { MAX77843_MUIC_IRQ_INT3_VDNMON,        "MUIC-VDNMON" },
 162         { MAX77843_MUIC_IRQ_INT3_DNRES,         "MUIC-DNRES" },
 163         { MAX77843_MUIC_IRQ_INT3_MPNACK,        "MUIC-MPNACK"},
 164         { MAX77843_MUIC_IRQ_INT3_MRXBUFOW,      "MUIC-MRXBUFOW"},
 165         { MAX77843_MUIC_IRQ_INT3_MRXTRF,        "MUIC-MRXTRF"},
 166         { MAX77843_MUIC_IRQ_INT3_MRXPERR,       "MUIC-MRXPERR"},
 167         { MAX77843_MUIC_IRQ_INT3_MRXRDY,        "MUIC-MRXRDY"},
 168 };
 169
 170 static const struct regmap_config max77843_muic_regmap_config = {
 171         .reg_bits       = 8,
 172         .val_bits       = 8,
 173         .max_register   = MAX77843_MUIC_REG_END,
 174 };
 175
 176 static const struct regmap_irq max77843_muic_irq[] = {
 177         /* INT1 interrupt */
 178         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC, },
 179         { .reg_offset = 0, .mask = MAX77843_MUIC_ADCERROR, },
 180         { .reg_offset = 0, .mask = MAX77843_MUIC_ADC1K, },
 181
 182         /* INT2 interrupt */
 183         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGTYP, },
 184         { .reg_offset = 1, .mask = MAX77843_MUIC_CHGDETRUN, },
 185         { .reg_offset = 1, .mask = MAX77843_MUIC_DCDTMR, },
 186         { .reg_offset = 1, .mask = MAX77843_MUIC_DXOVP, },
 187         { .reg_offset = 1, .mask = MAX77843_MUIC_VBVOLT, },
 188
 189         /* INT3 interrupt */
 190         { .reg_offset = 2, .mask = MAX77843_MUIC_VBADC, },
 191         { .reg_offset = 2, .mask = MAX77843_MUIC_VDNMON, },
 192         { .reg_offset = 2, .mask = MAX77843_MUIC_DNRES, },
 193         { .reg_offset = 2, .mask = MAX77843_MUIC_MPNACK, },
 194         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXBUFOW, },
 195         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXTRF, },
 196         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXPERR, },
 197         { .reg_offset = 2, .mask = MAX77843_MUIC_MRXRDY, },
 198 };
 199
 200 static const struct regmap_irq_chip max77843_muic_irq_chip = {
 201         .name           = "max77843-muic",
 202         .status_base    = MAX77843_MUIC_REG_INT1,
 203         .mask_base      = MAX77843_MUIC_REG_INTMASK1,
 204         .mask_invert    = true,
 205         .num_regs       = 3,
 206         .irqs           = max77843_muic_irq,
 207         .num_irqs       = ARRAY_SIZE(max77843_muic_irq),
 208 };
 209
 210 static int max77843_muic_set_path(struct max77843_muic_info *info,
 211                 u8 val, bool attached)
 212 {
 213         struct max77843 *max77843 = info->max77843;
 214         int ret = 0;
 215         unsigned int ctrl1, ctrl2;
 216
 217         if (attached)
 218                 ctrl1 = val;
 219         else
 220                 ctrl1 = CONTROL1_SW_OPEN;
 221
 222         ret = regmap_update_bits(max77843->regmap_muic,
 223                         MAX77843_MUIC_REG_CONTROL1,
 224                         CONTROL1_COM_SW, ctrl1);
 225         if (ret < 0) {
 226                 dev_err(info->dev, "Cannot switch MUIC port\n");
 227                 return ret;
 228         }
 229
 230         if (attached)
 231                 ctrl2 = MAX77843_MUIC_CONTROL2_CPEN_MASK;
 232         else
 233                 ctrl2 = MAX77843_MUIC_CONTROL2_LOWPWR_MASK;
 234
 235         ret = regmap_update_bits(max77843->regmap_muic,
 236                         MAX77843_MUIC_REG_CONTROL2,
 237                         MAX77843_MUIC_CONTROL2_LOWPWR_MASK |
 238                         MAX77843_MUIC_CONTROL2_CPEN_MASK, ctrl2);
 239         if (ret < 0) {
 240                 dev_err(info->dev, "Cannot update lowpower mode\n");
 241                 return ret;
 242         }
 243
 244         dev_dbg(info->dev,
 245                 "CONTROL1 : 0x%02x, CONTROL2 : 0x%02x, state : %s\n",
 246                 ctrl1, ctrl2, attached ? "attached" : "detached");
 247
 248         return 0;
 249 }
 250
 251 static int max77843_muic_get_cable_type(struct max77843_muic_info *info,
 252                 enum max77843_muic_cable_group group, bool *attached)
 253 {
 254         int adc, chg_type, cable_type, gnd_type;
 255
 256         adc = info->status[MAX77843_MUIC_STATUS1] &
 257                         MAX77843_MUIC_STATUS1_ADC_MASK;
 258         adc >>= STATUS1_ADC_SHIFT;
 259
 260         switch (group) {
 261         case MAX77843_CABLE_GROUP_ADC:
 262                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 263                         *attached = false;
 264                         cable_type = info->prev_cable_type;
 265                         info->prev_cable_type = MAX77843_MUIC_ADC_OPEN;
 266                 } else {
 267                         *attached = true;
 268                         cable_type = info->prev_cable_type = adc;
 269                 }
 270                 break;
 271         case MAX77843_CABLE_GROUP_CHG:
 272                 chg_type = info->status[MAX77843_MUIC_STATUS2] &
 273                                 MAX77843_MUIC_STATUS2_CHGTYP_MASK;
 274
 275                 /* Check GROUND accessory with charger cable */
 276                 if (adc == MAX77843_MUIC_ADC_GROUND) {
 277                         if (chg_type == MAX77843_MUIC_CHG_NONE) {
 278                                 /* The following state when charger cable is
 279                                  * disconnected but the GROUND accessory still
 280                                  * connected */
 281                                 *attached = false;
 282                                 cable_type = info->prev_chg_type;
 283                                 info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 284                         } else {
 285
 286                                 /* The following state when charger cable is
 287                                  * connected on the GROUND accessory */
 288                                 *attached = true;
 289                                 cable_type = MAX77843_MUIC_CHG_GND;
 290                                 info->prev_chg_type = MAX77843_MUIC_CHG_GND;
 291                         }
 292                         break;
 293                 }
 294
 295                 if (chg_type == MAX77843_MUIC_CHG_NONE) {
 296                         *attached = false;
 297                         cable_type = info->prev_chg_type;
 298                         info->prev_chg_type = MAX77843_MUIC_CHG_NONE;
 299                 } else {
 300                         *attached = true;
 301                         cable_type = info->prev_chg_type = chg_type;
 302                 }
 303                 break;
 304         case MAX77843_CABLE_GROUP_ADC_GND:
 305                 if (adc == MAX77843_MUIC_ADC_OPEN) {
 306                         *attached = false;
 307                         cable_type = info->prev_gnd_type;
 308                         info->prev_gnd_type = MAX77843_MUIC_ADC_OPEN;
 309                 } else {
 310                         *attached = true;
 311
 312                         /* Offset|ADC1K|VBVolt|
 313                          *    0x1|    0|     0| USB-HOST
 314                          *    0x1|    0|     1| USB-HOST with VB
 315                          *    0x1|    1|     0| MHL
 316                          *    0x1|    1|     1| MHL with VB */
 317                         /* Get ADC1K register bit */
 318                         gnd_type = (info->status[MAX77843_MUIC_STATUS1] &
 319                                         MAX77843_MUIC_STATUS1_ADC1K_MASK);
 320
 321                         /* Get VBVolt register bit */
 322                         gnd_type |= (info->status[MAX77843_MUIC_STATUS2] &
 323                                         MAX77843_MUIC_STATUS2_VBVOLT_MASK);
 324                         gnd_type >>= STATUS2_VBVOLT_SHIFT;
 325
 326                         /* Offset of GND cable */
 327                         gnd_type |= MAX77843_MUIC_GND_USB_HOST;
 328                         cable_type = info->prev_gnd_type = gnd_type;
 329                 }
 330                 break;
 331         default:
 332                 dev_err(info->dev, "Unknown cable group (%d)\n", group);
 333                 cable_type = -EINVAL;
 334                 break;
 335         }
 336
 337         return cable_type;
 338 }
 339
 340 static int max77843_muic_adc_gnd_handler(struct max77843_muic_info *info)
 341 {
 342         int ret, gnd_cable_type;
 343         bool attached;
 344
 345         gnd_cable_type = max77843_muic_get_cable_type(info,
 346                         MAX77843_CABLE_GROUP_ADC_GND, &attached);
 347         dev_dbg(info->dev, "external connector is %s (gnd:0x%02x)\n",
 348                         attached ? "attached" : "detached", gnd_cable_type);
 349
 350         switch (gnd_cable_type) {
 351         case MAX77843_MUIC_GND_USB_HOST:
 352         case MAX77843_MUIC_GND_USB_HOST_VB:
 353                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 354                 if (ret < 0)
 355                         return ret;
 356
 357                 extcon_set_cable_state(info->edev, "USB-HOST", attached);
 358                 break;
 359         case MAX77843_MUIC_GND_MHL_VB:
 360         case MAX77843_MUIC_GND_MHL:
 361                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 362                 if (ret < 0)
 363                         return ret;
 364
 365                 extcon_set_cable_state(info->edev, "MHL", attached);
 366                 break;
 367         default:
 368                 dev_err(info->dev, "failed to detect %s accessory(gnd:0x%x)\n",
 369                         attached ? "attached" : "detached", gnd_cable_type);
 370                 return -EINVAL;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int max77843_muic_jig_handler(struct max77843_muic_info *info,
 377                 int cable_type, bool attached)
 378 {
 379         int ret;
 380         u8 path = CONTROL1_SW_OPEN;
 381
 382         dev_dbg(info->dev, "external connector is %s (adc:0x%02x)\n",
 383                         attached ? "attached" : "detached", cable_type);
 384
 385         switch (cable_type) {
 386         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 387         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 388                 path = CONTROL1_SW_USB;
 389                 break;
 390         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 391                 path = CONTROL1_SW_UART;
 392                 break;
 393         default:
 394                 return -EINVAL;
 395         }
 396
 397         ret = max77843_muic_set_path(info, path, attached);
 398         if (ret < 0)
 399                 return ret;
 400
 401         extcon_set_cable_state(info->edev, "JIG", attached);
 402
 403         return 0;
 404 }
 405
 406 static int max77843_muic_adc_handler(struct max77843_muic_info *info)
 407 {
 408         int ret, cable_type;
 409         bool attached;
 410
 411         cable_type = max77843_muic_get_cable_type(info,
 412                         MAX77843_CABLE_GROUP_ADC, &attached);
 413
 414         dev_dbg(info->dev,
 415                 "external connector is %s (adc:0x%02x, prev_adc:0x%x)\n",
 416                 attached ? "attached" : "detached", cable_type,
 417                 info->prev_cable_type);
 418
 419         switch (cable_type) {
 420         case MAX77843_MUIC_ADC_GROUND:
 421                 ret = max77843_muic_adc_gnd_handler(info);
 422                 if (ret < 0)
 423                         return ret;
 424                 break;
 425         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_OFF:
 426         case MAX77843_MUIC_ADC_FACTORY_MODE_USB_ON:
 427         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_OFF:
 428                 ret = max77843_muic_jig_handler(info, cable_type, attached);
 429                 if (ret < 0)
 430                         return ret;
 431                 break;
 432         case MAX77843_MUIC_ADC_SEND_END_BUTTON:
 433         case MAX77843_MUIC_ADC_REMOTE_S1_BUTTON:
 434         case MAX77843_MUIC_ADC_REMOTE_S2_BUTTON:
 435         case MAX77843_MUIC_ADC_REMOTE_S3_BUTTON:
 436         case MAX77843_MUIC_ADC_REMOTE_S4_BUTTON:
 437         case MAX77843_MUIC_ADC_REMOTE_S5_BUTTON:
 438         case MAX77843_MUIC_ADC_REMOTE_S6_BUTTON:
 439         case MAX77843_MUIC_ADC_REMOTE_S7_BUTTON:
 440         case MAX77843_MUIC_ADC_REMOTE_S8_BUTTON:
 441         case MAX77843_MUIC_ADC_REMOTE_S9_BUTTON:
 442         case MAX77843_MUIC_ADC_REMOTE_S10_BUTTON:
 443         case MAX77843_MUIC_ADC_REMOTE_S11_BUTTON:
 444         case MAX77843_MUIC_ADC_REMOTE_S12_BUTTON:
 445         case MAX77843_MUIC_ADC_RESERVED_ACC_1:
 446         case MAX77843_MUIC_ADC_RESERVED_ACC_2:
 447         case MAX77843_MUIC_ADC_RESERVED_ACC_3:
 448         case MAX77843_MUIC_ADC_RESERVED_ACC_4:
 449         case MAX77843_MUIC_ADC_RESERVED_ACC_5:
 450         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE2:
 451         case MAX77843_MUIC_ADC_PHONE_POWERED_DEV:
 452         case MAX77843_MUIC_ADC_TTY_CONVERTER:
 453         case MAX77843_MUIC_ADC_UART_CABLE:
 454         case MAX77843_MUIC_ADC_CEA936A_TYPE1_CHG:
 455         case MAX77843_MUIC_ADC_AV_CABLE_NOLOAD:
 456         case MAX77843_MUIC_ADC_CEA936A_TYPE2_CHG:
 457         case MAX77843_MUIC_ADC_FACTORY_MODE_UART_ON:
 458         case MAX77843_MUIC_ADC_AUDIO_DEVICE_TYPE1:
 459         case MAX77843_MUIC_ADC_OPEN:
 460                 dev_err(info->dev,
 461                         "accessory is %s but it isn't used (adc:0x%x)\n",
 462                         attached ? "attached" : "detached", cable_type);
 463                 return -EAGAIN;
 464         default:
 465                 dev_err(info->dev,
 466                         "failed to detect %s accessory (adc:0x%x)\n",
 467                         attached ? "attached" : "detached", cable_type);
 468                 return -EINVAL;
 469         }
 470
 471         return 0;
 472 }
 473
 474 static int max77843_muic_chg_handler(struct max77843_muic_info *info)
 475 {
 476         int ret, chg_type, gnd_type;
 477         bool attached;
 478
 479         chg_type = max77843_muic_get_cable_type(info,
 480                         MAX77843_CABLE_GROUP_CHG, &attached);
 481
 482         dev_dbg(info->dev,
 483                 "external connector is %s(chg_type:0x%x, prev_chg_type:0x%x)\n",
 484                 attached ? "attached" : "detached",
 485                 chg_type, info->prev_chg_type);
 486
 487         switch (chg_type) {
 488         case MAX77843_MUIC_CHG_USB:
 489                 ret = max77843_muic_set_path(info, CONTROL1_SW_USB, attached);
 490                 if (ret < 0)
 491                         return ret;
 492
 493                 extcon_set_cable_state(info->edev, "USB", attached);
 494                 break;
 495         case MAX77843_MUIC_CHG_DOWNSTREAM:
 496                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 497                 if (ret < 0)
 498                         return ret;
 499
 500                 extcon_set_cable_state(info->edev,
 501                                 "CHARGER-DOWNSTREAM", attached);
 502                 break;
 503         case MAX77843_MUIC_CHG_DEDICATED:
 504                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 505                 if (ret < 0)
 506                         return ret;
 507
 508                 extcon_set_cable_state(info->edev, "TA", attached);
 509                 break;
 510         case MAX77843_MUIC_CHG_SPECIAL_500MA:
 511                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 512                 if (ret < 0)
 513                         return ret;
 514
 515                 extcon_set_cable_state(info->edev, "SLOW-CHAREGER", attached);
 516                 break;
 517         case MAX77843_MUIC_CHG_SPECIAL_1A:
 518                 ret = max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 519                 if (ret < 0)
 520                         return ret;
 521
 522                 extcon_set_cable_state(info->edev, "FAST-CHARGER", attached);
 523                 break;
 524         case MAX77843_MUIC_CHG_GND:
 525                 gnd_type = max77843_muic_get_cable_type(info,
 526                                 MAX77843_CABLE_GROUP_ADC_GND, &attached);
 527
 528                 /* Charger cable on MHL accessory is attach or detach */
 529                 if (gnd_type == MAX77843_MUIC_GND_MHL_VB)
 530                         extcon_set_cable_state(info->edev, "TA", true);
 531                 else if (gnd_type == MAX77843_MUIC_GND_MHL)
 532                         extcon_set_cable_state(info->edev, "TA", false);
 533                 break;
 534         case MAX77843_MUIC_CHG_NONE:
 535                 break;
 536         default:
 537                 dev_err(info->dev,
 538                         "failed to detect %s accessory (chg_type:0x%x)\n",
 539                         attached ? "attached" : "detached", chg_type);
 540
 541                 max77843_muic_set_path(info, CONTROL1_SW_OPEN, attached);
 542                 return -EINVAL;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static void max77843_muic_irq_work(struct work_struct *work)
 549 {
 550         struct max77843_muic_info *info = container_of(work,
 551                         struct max77843_muic_info, irq_work);
 552         struct max77843 *max77843 = info->max77843;
 553         int ret = 0;
 554
 555         mutex_lock(&info->mutex);
 556
 557         ret = regmap_bulk_read(max77843->regmap_muic,
 558                         MAX77843_MUIC_REG_STATUS1, info->status,
 559                         MAX77843_MUIC_STATUS_NUM);
 560         if (ret) {
 561                 dev_err(info->dev, "Cannot read STATUS registers\n");
 562                 mutex_unlock(&info->mutex);
 563                 return;
 564         }
 565
 566         if (info->irq_adc) {
 567                 ret = max77843_muic_adc_handler(info);
 568                 if (ret)
 569                         dev_err(info->dev, "Unknown cable type\n");
 570                 info->irq_adc = false;
 571         }
 572
 573         if (info->irq_chg) {
 574                 ret = max77843_muic_chg_handler(info);
 575                 if (ret)
 576                         dev_err(info->dev, "Unknown charger type\n");
 577                 info->irq_chg = false;
 578         }
 579
 580         mutex_unlock(&info->mutex);
 581 }
 582
 583 static irqreturn_t max77843_muic_irq_handler(int irq, void *data)
 584 {
 585         struct max77843_muic_info *info = data;
 586         int i, irq_type = -1;
 587
 588         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++)
 589                 if (irq == max77843_muic_irqs[i].virq)
 590                         irq_type = max77843_muic_irqs[i].irq;
 591
 592         switch (irq_type) {
 593         case MAX77843_MUIC_IRQ_INT1_ADC:
 594         case MAX77843_MUIC_IRQ_INT1_ADCERROR:
 595         case MAX77843_MUIC_IRQ_INT1_ADC1K:
 596                 info->irq_adc = true;
 597                 break;
 598         case MAX77843_MUIC_IRQ_INT2_CHGTYP:
 599         case MAX77843_MUIC_IRQ_INT2_CHGDETRUN:
 600         case MAX77843_MUIC_IRQ_INT2_DCDTMR:
 601         case MAX77843_MUIC_IRQ_INT2_DXOVP:
 602         case MAX77843_MUIC_IRQ_INT2_VBVOLT:
 603                 info->irq_chg = true;
 604                 break;
 605         case MAX77843_MUIC_IRQ_INT3_VBADC:
 606         case MAX77843_MUIC_IRQ_INT3_VDNMON:
 607         case MAX77843_MUIC_IRQ_INT3_DNRES:
 608         case MAX77843_MUIC_IRQ_INT3_MPNACK:
 609         case MAX77843_MUIC_IRQ_INT3_MRXBUFOW:
 610         case MAX77843_MUIC_IRQ_INT3_MRXTRF:
 611         case MAX77843_MUIC_IRQ_INT3_MRXPERR:
 612         case MAX77843_MUIC_IRQ_INT3_MRXRDY:
 613                 break;
 614         default:
 615                 dev_err(info->dev, "Cannot recognize IRQ(%d)\n", irq_type);
 616                 break;
 617         }
 618
 619         schedule_work(&info->irq_work);
 620
 621         return IRQ_HANDLED;
 622 }
 623
 624 static void max77843_muic_detect_cable_wq(struct work_struct *work)
 625 {
 626         struct max77843_muic_info *info = container_of(to_delayed_work(work),
 627                         struct max77843_muic_info, wq_detcable);
 628         struct max77843 *max77843 = info->max77843;
 629         int chg_type, adc, ret;
 630         bool attached;
 631
 632         mutex_lock(&info->mutex);
 633
 634         ret = regmap_bulk_read(max77843->regmap_muic,
 635                         MAX77843_MUIC_REG_STATUS1, info->status,
 636                         MAX77843_MUIC_STATUS_NUM);
 637         if (ret) {
 638                 dev_err(info->dev, "Cannot read STATUS registers\n");
 639                 goto err_cable_wq;
 640         }
 641
 642         adc = max77843_muic_get_cable_type(info,
 643                         MAX77843_CABLE_GROUP_ADC, &attached);
 644         if (attached && adc != MAX77843_MUIC_ADC_OPEN) {
 645                 ret = max77843_muic_adc_handler(info);
 646                 if (ret < 0) {
 647                         dev_err(info->dev, "Cannot detect accessory\n");
 648                         goto err_cable_wq;
 649                 }
 650         }
 651
 652         chg_type = max77843_muic_get_cable_type(info,
 653                         MAX77843_CABLE_GROUP_CHG, &attached);
 654         if (attached && chg_type != MAX77843_MUIC_CHG_NONE) {
 655                 ret = max77843_muic_chg_handler(info);
 656                 if (ret < 0) {
 657                         dev_err(info->dev, "Cannot detect charger accessory\n");
 658                         goto err_cable_wq;
 659                 }
 660         }
 661
 662 err_cable_wq:
 663         mutex_unlock(&info->mutex);
 664 }
 665
 666 static int max77843_muic_set_debounce_time(struct max77843_muic_info *info,
 667                 enum max77843_muic_adc_debounce_time time)
 668 {
 669         struct max77843 *max77843 = info->max77843;
 670         int ret;
 671
 672         switch (time) {
 673         case MAX77843_DEBOUNCE_TIME_5MS:
 674         case MAX77843_DEBOUNCE_TIME_10MS:
 675         case MAX77843_DEBOUNCE_TIME_25MS:
 676         case MAX77843_DEBOUNCE_TIME_38_62MS:
 677                 ret = regmap_update_bits(max77843->regmap_muic,
 678                                 MAX77843_MUIC_REG_CONTROL4,
 679                                 MAX77843_MUIC_CONTROL4_ADCDBSET_MASK,
 680                                 time << CONTROL4_ADCDBSET_SHIFT);
 681                 if (ret < 0) {
 682                         dev_err(info->dev, "Cannot write MUIC regmap\n");
 683                         return ret;
 684                 }
 685                 break;
 686         default:
 687                 dev_err(info->dev, "Invalid ADC debounce time\n");
 688                 return -EINVAL;
 689         }
 690
 691         return 0;
 692 }
 693
 694 static int max77843_init_muic_regmap(struct max77843 *max77843)
 695 {
 696         int ret;
 697
 698         max77843->i2c_muic = i2c_new_dummy(max77843->i2c->adapter,
 699                         I2C_ADDR_MUIC);
 700         if (!max77843->i2c_muic) {
 701                 dev_err(&max77843->i2c->dev,
 702                                 "Cannot allocate I2C device for MUIC\n");
 703                 return -ENOMEM;
 704         }
 705
 706         i2c_set_clientdata(max77843->i2c_muic, max77843);
 707
 708         max77843->regmap_muic = devm_regmap_init_i2c(max77843->i2c_muic,
 709                         &max77843_muic_regmap_config);
 710         if (IS_ERR(max77843->regmap_muic)) {
 711                 ret = PTR_ERR(max77843->regmap_muic);
 712                 goto err_muic_i2c;
 713         }
 714
 715         ret = regmap_add_irq_chip(max77843->regmap_muic, max77843->irq,
 716                         IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_SHARED,
 717                         0, &max77843_muic_irq_chip, &max77843->irq_data_muic);
 718         if (ret < 0) {
 719                 dev_err(&max77843->i2c->dev, "Cannot add MUIC IRQ chip\n");
 720                 goto err_muic_i2c;
 721         }
 722
 723         return 0;
 724
 725 err_muic_i2c:
 726         i2c_unregister_device(max77843->i2c_muic);
 727
 728         return ret;
 729 }
 730
 731 static int max77843_muic_probe(struct platform_device *pdev)
 732 {
 733         struct max77843 *max77843 = dev_get_drvdata(pdev->dev.parent);
 734         struct max77843_muic_info *info;
 735         unsigned int id;
 736         int i, ret;
 737
 738         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 739         if (!info)
 740                 return -ENOMEM;
 741
 742         info->dev = &pdev->dev;
 743         info->max77843 = max77843;
 744
 745         platform_set_drvdata(pdev, info);
 746         mutex_init(&info->mutex);
 747
 748         /* Initialize i2c and regmap */
 749         ret = max77843_init_muic_regmap(max77843);
 750         if (ret) {
 751                 dev_err(&pdev->dev, "Failed to init MUIC regmap\n");
 752                 return ret;
 753         }
 754
 755         /* Turn off auto detection configuration */
 756         ret = regmap_update_bits(max77843->regmap_muic,
 757                         MAX77843_MUIC_REG_CONTROL4,
 758                         MAX77843_MUIC_CONTROL4_USBAUTO_MASK |
 759                         MAX77843_MUIC_CONTROL4_FCTAUTO_MASK,
 760                         CONTROL4_AUTO_DISABLE);
 761
 762         /* Initialize extcon device */
 763         info->edev = devm_extcon_dev_allocate(&pdev->dev,
 764                         max77843_extcon_cable);
 765         if (IS_ERR(info->edev)) {
 766                 dev_err(&pdev->dev, "Failed to allocate memory for extcon\n");
 767                 ret = -ENODEV;
 768                 goto err_muic_irq;
 769         }
 770
 771         ret = devm_extcon_dev_register(&pdev->dev, info->edev);
 772         if (ret) {
 773                 dev_err(&pdev->dev, "Failed to register extcon device\n");
 774                 goto err_muic_irq;
 775         }
 776
 777         /* Set ADC debounce time */
 778         max77843_muic_set_debounce_time(info, MAX77843_DEBOUNCE_TIME_25MS);
 779
 780         /* Set initial path for UART */
 781         max77843_muic_set_path(info, CONTROL1_SW_UART, true);
 782
 783         /* Check revision number of MUIC device */
 784         ret = regmap_read(max77843->regmap_muic, MAX77843_MUIC_REG_ID, &id);
 785         if (ret < 0) {
 786                 dev_err(&pdev->dev, "Failed to read revision number\n");
 787                 goto err_muic_irq;
 788         }
 789         dev_info(info->dev, "MUIC device ID : 0x%x\n", id);
 790
 791         /* Support virtual irq domain for max77843 MUIC device */
 792         INIT_WORK(&info->irq_work, max77843_muic_irq_work);
 793
 794         for (i = 0; i < ARRAY_SIZE(max77843_muic_irqs); i++) {
 795                 struct max77843_muic_irq *muic_irq = &max77843_muic_irqs[i];
 796                 unsigned int virq = 0;
 797
 798                 virq = regmap_irq_get_virq(max77843->irq_data_muic,
 799                                 muic_irq->irq);
 800                 if (virq <= 0) {
 801                         ret = -EINVAL;
 802                         goto err_muic_irq;
 803                 }
 804                 muic_irq->virq = virq;
 805
 806                 ret = devm_request_threaded_irq(&pdev->dev, virq, NULL,
 807                                 max77843_muic_irq_handler, IRQF_NO_SUSPEND,
 808                                 muic_irq->name, info);
 809                 if (ret) {
 810                         dev_err(&pdev->dev,
 811                                 "Failed to request irq (IRQ: %d, error: %d)\n",
 812                                 muic_irq->irq, ret);
 813                         goto err_muic_irq;
 814                 }
 815         }
 816
 817         /* Detect accessory after completing the initialization of platform */
 818         INIT_DELAYED_WORK(&info->wq_detcable, max77843_muic_detect_cable_wq);
 819         queue_delayed_work(system_power_efficient_wq,
 820                         &info->wq_detcable, msecs_to_jiffies(DELAY_MS_DEFAULT));
 821
 822         return 0;
 823
 824 err_muic_irq:
 825         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 826         i2c_unregister_device(max77843->i2c_muic);
 827
 828         return ret;
 829 }
 830
 831 static int max77843_muic_remove(struct platform_device *pdev)
 832 {
 833         struct max77843_muic_info *info = platform_get_drvdata(pdev);
 834         struct max77843 *max77843 = info->max77843;
 835
 836         cancel_work_sync(&info->irq_work);
 837         regmap_del_irq_chip(max77843->irq, max77843->irq_data_muic);
 838         i2c_unregister_device(max77843->i2c_muic);
 839
 840         return 0;
 841 }
 842
 843 static const struct platform_device_id max77843_muic_id[] = {
 844         { "max77843-muic", },
 845         { /* sentinel */ },
 846 };
 847 MODULE_DEVICE_TABLE(platform, max77843_muic_id);
 848
 849 static struct platform_driver max77843_muic_driver = {
 850         .driver         = {
 851                 .name           = "max77843-muic",
 852         },
 853         .probe          = max77843_muic_probe,
 854         .remove         = max77843_muic_remove,
 855         .id_table       = max77843_muic_id,
 856 };
 857
 858 static int __init max77843_muic_init(void)
 859 {
 860         return platform_driver_register(&max77843_muic_driver);
 861 }
 862 subsys_initcall(max77843_muic_init);
 863
 864 MODULE_DESCRIPTION("Maxim MAX77843 Extcon driver");
 865 MODULE_AUTHOR("Jaewon Kim <jaewon02.kim@samsung.com>");
 866 MODULE_LICENSE("GPL");